pyspark.SparkContext.parallelize#

SparkContext.parallelize(c, numSlices=None)[source]#

Distribute a local Python collection to form an RDD. Using range is recommended if the input represents a range for performance.

New in version 0.7.0.

Parameters

ccollections.abc.Iterable: iterable collection to distribute
numSlicesint, optional: the number of partitions of the new RDD

Returns

RDD: RDD representing distributed collection.

Examples

>>> sc.parallelize([0, 2, 3, 4, 6], 5).glom().collect()
[[0], [2], [3], [4], [6]]
>>> sc.parallelize(range(0, 6, 2), 5).glom().collect()
[[], [0], [], [2], [4]]

Deal with a list of strings.

>>> strings = ["a", "b", "c"]
>>> sc.parallelize(strings, 2).glom().collect()
[['a'], ['b', 'c']]